Dun & Bradstreet DOT NET Developer Interview Questions and Answers

Q1. Coding questions
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Q2. Dotnet Garbage collection
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Mid level programming and mcq questions

Q1. Architecture round and coding Peer programming C# questions React questions Recurssive programming String manipulation
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Q2. String manuplation Array questions
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Qunatative, Reasoning, Blood Relation

Q1. CS fundamentals, DSA
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Q1. Behavioural Questions only
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Aptitude Test + Technical Questions + One Coding Question

Q1. Detect the loop in a Singly linked list
Ans. 
Detect loop in a singly linked list
• Use two pointers, one moving one step at a time and the other moving two steps at a time

• If there is a loop, the two pointers will eventually meet

• If any of the pointers reach the end of the list, there is no loop
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Q2. 2 Sum (find a pair of numbers that sums up to a target)
Ans. 
The 2 Sum problem involves finding a pair of numbers in an array that adds up to a given target.
• Use a hash table to store the complement of each number as you iterate through the array.

• Check if the current number's complement exists in the hash table.

• If found, return the indices of the two numbers.

• If no pair is found, return an empty array.
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Round duration - 70 minutes
Round difficulty - Medium

Timing: Window for 2 days
Environment: Online
Time: 50 Min. for 50 MCQ and 20 min for 2 Coding Questions

Q1. 
Number Pattern Problem Statement
Design a seating arrangement for a high-security meeting. There are 'N' rows of tables set up where the first row contains one table, the second row contains two tables, a...read more
Ans. 
Design a seating arrangement for a high-security meeting with specific table assignments for security personnel and guests.
• Create a loop to iterate through each row from 1 to N.

• Assign tables on either end of each row to security personnel.

• For rows with only one table, assign it to security personnel.

• Display the seating arrangement with the number of people at each table.

• Example: For 4 rows, the output pattern is 1, 11,
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Q2. 
Insert Interval Problem Statement
You are provided with a list of 'N' non-overlapping intervals, each defined by two integers, 'start' and 'end', sorted in ascending order by 'start' values. Your task is ...read more
Ans. 
The task is to insert a given interval into a list of non-overlapping intervals while maintaining sorted order.
• Iterate through the list of intervals to find the correct position to insert the given interval.

• Merge any overlapping intervals with the given interval.

• Update the list of intervals accordingly.

• Handle edge cases such as when the given interval completely overlaps with existing intervals.
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Round duration - 45 minutes
Round difficulty - Medium

Timing: Morning
Environment: On MS-Teams

Q1. 
Quick Sort Problem Statement
Sort the given array of integers in ascending order using the quick sort algorithm. Quick sort is a divide-and-conquer algorithm where a pivot point is chosen to partition the...read more
Ans. 
Quick sort is a divide-and-conquer algorithm that sorts an array by choosing a pivot point and partitioning the array into two parts recursively.
• Choose a pivot element (e.g., rightmost element) to partition the array into two subarrays.

• Recursively apply quick sort to the subarrays until the entire array is sorted.

• Time complexity can be optimized to NlogN in the worst case by selecting the pivot strategically.

• Ensure the...read more
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Q1. Basic for Core java
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Q2. Basics of selenium
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Q1. More on framework side
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Q2. Few question on Manual testing
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Q1. Intro about yourself
Ans. 
I am a Senior Engineer with 10+ years of experience in software development, specializing in backend systems and cloud technologies.
• 10+ years of experience in software development

• Specialize in backend systems and cloud technologies

• Strong problem-solving skills

• Experience with large-scale systems

• Proficient in programming languages like Java, Python, and SQL
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Q2. Discussion on Job role
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Q1. Java Based question answers
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Q2. Array traversal problem
Ans. 
Traverse an array of strings
• Use a loop to iterate through each element in the array

• Access each element using its index

• Perform any necessary operations on each element
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